HardLabs

Picalor

ul-gh·Picalor·picalor_hardware/circuit_schematics_pcb/picalor_pcb.kicad_pcb

Picalor PCB layout, top view — open source Raspberry Pi board by ul-gh

About the Picalor PCB

Picalor is an open source Raspberry Pi PCB design by ul-gh, published on GitHub under the GPL-3.0 license. It is a 4-layer board measuring 65 × 56 mm, with 112 components from 20 distinct parts.

Its main chip is the Raspberry_Pi_2_3, from the Raspberry Pi family. Other key parts include the ADS1256IDB, LM358 and LM336BM-2.5. By type, the board carries 59 resistors, 35 capacitors, 11 connectors, 4 ICs, 2 inductors and 1 crystal.

It belongs with the sensors designs in this gallery.

From the project

Picalor - Multi-Channel Heat Balance Calorimetry on the Raspberry Pi

Thermal power (or heat flow) measurement of one segmented or multiple individual liquid-cooled or liquid-heated systems under the assumption that the enthalpy difference of the fluid entering and exiting each system per unit of time is equal to the energy dissipated or released by the system.

Quasi-isothermal condition can be achieved by using a sufficiently high flow rate. Accurate heat flow measurements under these conditions require very sensitive and robust differential temperature sensing.

Picalor, from the project README
From the project README

Main components on the Picalor

ADS1256IDBLM358LM336BM-2.5

Picalor bill of materials (BOM)

112 components, 20 distinct parts.

QtyPartRefs
2
ADS1256IDB
U1, U2
1
LM358
U3
1
LM336BM-2.5
U4
1
7.68M
Y1
4
AST21304
J1, J3, J5, J7
6
AST21303
J2, J4, J6, J8, J10, J11
1
Raspberry_Pi_2_3
J9
2
BLM21AG102
L1, L2
18
1u
C1, C2, C3, C4, C5, C6, C7, C8 +10
3
T491D 47U
C17, C28, C31
6
100n
C18, C20, C21, C22, C24, C25
2
100p
C19, C23
2
47p
C26, C27
4
10n
C32, C33, C34, C35
20
10k
R1, R4, R6, R8, R10, R12, R14, R16 +12
18
1k1
R2, R3, R5, R7, R9, R11, R13, R15 +10
3
10
R35, R48, R51
9
100
R36, R37, R38, R39, R40, R44, R45, R46 +1
5
2k2
R41, R49, R53, R55, R58
4
220
R54, R56, R57, R59

Picalor design files

The KiCad project lives in the ul-gh/Picalor repository on GitHub; these links point at the commit this page was built from.

Picalor: common questions

What microcontroller does the Picalor use?

The Picalor is built around the Raspberry_Pi_2_3, from the Raspberry Pi family.

How big is the Picalor PCB?

The Picalor measures 65 × 56 mm, has 4 copper layers and is 4.69 mm thick.

How many components are on the Picalor?

112 components, from 20 distinct parts. The full bill of materials is listed on this page.

Where can I download the Picalor design files?

From the ul-gh/Picalor repository on GitHub, which has the KiCad layout and the schematic; the links under Design files point to each one.

Can I use the Picalor design in my own project?

Yes, under the terms of its GPL-3.0 license, which ul-gh chose for the repository.

Can I test firmware for the Picalor without the hardware?

Yes. HardLabs builds a simulation of the board from its netlist and BOM, so you can run and debug Raspberry Pi firmware against it before you order a PCB.

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